Method and apparatus for the reduction of electromagnetic radiation from display screens
First Claim
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1. A display screen comprising:
- a printed circuit board (PCB) having a front face and a rear face;
a plurality of light emitting elements mounted on said PCB to reside on the front face of the PCB and provide a display;
control circuitry mounted directly or indirectly to said printed circuit board to drive said light emitting elements;
a layer of material conductive to electromagnetic radiation provided on a front face of said PCB to cover a substantial portion of said front face and positioned between said PCB and the light emitting portions of said light emitting elements;
a plurality of conductivity isolated areas in said layer to allow isolated connections from said light emitting elements to said PCB; and
a housing mounted around a perimeter of said PCB and extending around said driving circuitry containing material conductive to electromagnetic radiation to substantially enclose said driving circuitry within said housing and said layer.
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Abstract
This invention relates to a method and apparatus for the reduction of electromagnetic radiation from display screens. The display screen is substantially encased within a conductive shield formed by the housing around the display screen, a rear housing and a conductive coating or layer over the front face of a PCB panel on which light-emitting elements may be mounted. Interconnections are provided between all the components of the shield so as to limit any gaps within the shield to a size sufficiently small to minimize damaging electromagnetic noise.
4 Citations
6 Claims
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1. A display screen comprising:
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a printed circuit board (PCB) having a front face and a rear face;
a plurality of light emitting elements mounted on said PCB to reside on the front face of the PCB and provide a display;
control circuitry mounted directly or indirectly to said printed circuit board to drive said light emitting elements;
a layer of material conductive to electromagnetic radiation provided on a front face of said PCB to cover a substantial portion of said front face and positioned between said PCB and the light emitting portions of said light emitting elements;
a plurality of conductivity isolated areas in said layer to allow isolated connections from said light emitting elements to said PCB; and
a housing mounted around a perimeter of said PCB and extending around said driving circuitry containing material conductive to electromagnetic radiation to substantially enclose said driving circuitry within said housing and said layer. - View Dependent Claims (2, 3, 4, 5)
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6. A method of reducing electromagnetic radiation from a display screen comprising:
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providing a layer of electromagnetic conductive material on a front face of a printed circuit board used for mounting light emitting elements;
providing a plurality of electrically isolated points in or through said layer for the connection of said light emitting elements to said printed circuit board; and
surrounding a rear face of said printed circuit board with an electromagnetic conductive housing so as to substantially enclose driving circuitry behind the printed circuit board and the circuit board itself within a shield formed by said housing and said layer.
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Specification